Don---On some TR door locks it's necessary to squeeze the spring-loaded
clips that hold these locks in position. They snap into place when
installing them, but the "barbs" keep them from backing out. A pair of
needle nose pliers or a well placed screwdriver blade can dislodge the
grip from these clips. Put your key in the lock, twist and pull out on
the unit at the same time.
It's easier to picture this if you have possession of the new door
locks, as it's kind of crowded when peeking thru the door panel.